Which of the following would be expected to have the greatest impact on primary productivity? a. chemical energy b. nutrient availability c. solar energy d. water availability

The arm or forelimb of humans, horses, goats, and mice all exhibit the same three bone structures: humerus, ulna, and radius.

The relative frequency of an allele is A. the total number of copies of an allele in a gene pool. B. all the genes that are present in a the gene pool of a population. C.

Erosion in this area is most likely caused by A) wind. B) water. C) gravity. D) action of animals.

A cholinergic crisis is characterized by which event? stronger skeletal muscle contractions hypertension and respiratory failure excessive stimulation of the sympathetic nervous system excessive stimulation of the parasympathetic nervous system

Which arrangement of the earth, sun, and moon explains the highest high tide of the month?

What are two different habitats in a prairie ecosystem and name one organism found in each habitat.

Which level on the energy pyramid has the third most energy? A. primary producers B. primary consumers C. secondary consumers D. tertiary consumers

How do pH affect the stability of double-stranded nucleic acid?

What is the first step in the scientific process

Why is DDT so hazardous? A:it does not decompose fast B:it killed almost everything C: it traveled to many continents through water